DATAMATH CALCULATOR MUSEUM |
Texas Instruments TI-1798 (Malaysia)
Date of introduction: | 1990 | Display technology: | LCD |
New price: | Display size: | 8 | |
Size: | 5.4" x 4.1" x
1.15" 136 x 106 x 29 mm3 |
||
Weight: | 3.5 ounces, 99 grams | Serial No: | |
Batteries: | LR54 | Date of manufacture: | mth 03 year 1991 |
AC-Adapter: | Origin of manufacture: | Malaysia (I) | |
Precision: | 8 | Integrated circuits: | Toshiba T9731BU |
Memories: | 1 | ||
Program steps: | Courtesy of: | Joerg Woerner |
This
stylish small desktop calculator fits somewhere between the TI-1795A
and the TI-1775 in Texas
Instruments' small desktop calculator portfolio. Main difference
is the [GPM] key, a feature not known from the first generation
TI-1798 introduced already in 1986.
Dismantling this TI-1798 manufactured in
March 1991 by Inventec Corporation in
Malaysia
reveals a clean design centered around a Toshiba T9731BU single-chip calculator
circuit soldered on a double-sided printed circuit board (PCB) and powered by
four solar cells and a small LR54 (LR1130) backup battery
like its identical twin TI-510 manufactured for the
European market. The battery wasn't used with the first production batches of
the TI-1798 manufactured in Taiwan.
Inspecting
the PCB of this TI-1798 calculator brought our attention to a small mark reading
1OSB863-01B and we started compiling a list of the
PCB-Marks on calculators manufactured by OEMs for Texas Instruments.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, March 21, 2020. No reprints without written permission.